{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2025-39703 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-39703 is a critical vulnerability in Debian Debian Linux, published on 5 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-39703 and fix it if it is affected.\n\nWhat it is: CVE-2025-39703 is a critical vulnerability in Debian Debian Linux, published on 5 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2025-39703 in the wild and no public exploit code.\n\nAffected product: Debian Debian Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2025-39703/ (Markdown: https://insights.sbomify.com/CVE-2025-39703/index.md)","id":"CVE-2025-39703","markdown":"https://insights.sbomify.com/CVE-2025-39703/index.md","name":"CVE-2025-39703","record":{"aliases":["AZL-66923","AZL-73722","BELL-CVE-2025-39703","DEBIAN-CVE-2025-39703","GHSA-fjf6-f8jx-fjgp","ROOT-OS-DEBIAN-11-CVE-2025-39703","ROOT-OS-DEBIAN-12-CVE-2025-39703","ROOT-OS-DEBIAN-13-CVE-2025-39703","ROOT-OS-UBUNTU-2204-CVE-2025-39703","ROOT-OS-UBUNTU-2404-CVE-2025-39703","UBUNTU-CVE-2025-39703"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Linux kernel","requires_auth":"none","summary":"A remote attacker can cause a kernel crash and denial of service by sending malformed HSR frames that trigger a null dereference in the network stack.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":9.8,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-476","name":"NULL Pointer Dereference"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet, hsr: reject HSR frame if skb can't hold tag\n\nReceiving HSR frame with insufficient space to hold HSR tag in the skb\ncan result in a crash (kernel BUG):\n\n[   45.390915] skbuff: skb_under_panic: text:ffffffff86f32cac len:26 put:14 head:ffff888042418000 data:ffff888042417ff4 tail:0xe end:0x180 dev:bridge_slave_1\n[   45.392559] ------------[ cut here ]------------\n[   45.392912] kernel BUG at net/core/skbuff.c:211!\n[   45.393276] Oops: invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI\n[   45.393809] CPU: 1 UID: 0 PID: 2496 Comm: reproducer Not tainted 6.15.0 #12 PREEMPT(undef)\n[   45.394433] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\n[   45.395273] RIP: 0010:skb_panic+0x15b/0x1d0\n\n\u003csnip registers, remove unreliable trace\u003e\n\n[   45.402911] Call Trace:\n[   45.403105]  \u003cIRQ\u003e\n[   45.404470]  skb_push+0xcd/0xf0\n[   45.404726]  br_dev_queue_push_xmit+0x7c/0x6c0\n[   45.406513]  br_forward_finish+0x128/0x260\n[   45.408483]  __br_forward+0x42d/0x590\n[   45.409464]  maybe_deliver+0x2eb/0x420\n[   45.409763]  br_flood+0x174/0x4a0\n[   45.410030]  br_handle_frame_finish+0xc7c/0x1bc0\n[   45.411618]  br_handle_frame+0xac3/0x1230\n[   45.413674]  __netif_receive_skb_core.constprop.0+0x808/0x3df0\n[   45.422966]  __netif_receive_skb_one_core+0xb4/0x1f0\n[   45.424478]  __netif_receive_skb+0x22/0x170\n[   45.424806]  process_backlog+0x242/0x6d0\n[   45.425116]  __napi_poll+0xbb/0x630\n[   45.425394]  net_rx_action+0x4d1/0xcc0\n[   45.427613]  handle_softirqs+0x1a4/0x580\n[   45.427926]  do_softirq+0x74/0x90\n[   45.428196]  \u003c/IRQ\u003e\n\nThis issue was found by syzkaller.\n\nThe panic happens in br_dev_queue_push_xmit() once it receives a\ncorrupted skb with ETH header already pushed in linear data. When it\nattempts the skb_push() call, there's not enough headroom and\nskb_push() panics.\n\nThe corrupted skb is put on the queue by HSR layer, which makes a\nsequence of unintended transformations when it receives a specific\ncorrupted HSR frame (with incomplete TAG).\n\nFix it by dropping and consuming frames that are not long enough to\ncontain both ethernet and hsr headers.\n\nAlternative fix would be to check for enough headroom before skb_push()\nin br_dev_queue_push_xmit().\n\nIn the reproducer, this is injected via AF_PACKET, but I don't easily\nsee why it couldn't be sent over the wire from adjacent network.\n\nFurther Details:\n\nIn the reproducer, the following network interface chain is set up:\n\n┌────────────────┐   ┌────────────────┐\n│ veth0_to_hsr   ├───┤  hsr_slave0    ┼───┐\n└────────────────┘   └────────────────┘   │\n                                          │ ┌──────┐\n                                          ├─┤ hsr0 ├───┐\n                                          │ └──────┘   │\n┌────────────────┐   ┌────────────────┐   │            │┌────────┐\n│ veth1_to_hsr   ┼───┤  hsr_slave1    ├───┘            └┤        │\n└────────────────┘   └────────────────┘                ┌┼ bridge │\n                                                       ││        │\n                                                       │└────────┘\n                                                       │\n                                        ┌───────┐      │\n                                        │  ...  ├──────┘\n                                        └───────┘\n\nTo trigger the events leading up to crash, reproducer sends a corrupted\nHSR fr\n---truncated---","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"net, hsr: reject HSR frame if skb can't hold tag","id":"CVE-2025-39703","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"debian:debian_linux","products":["debian:debian_linux","linux:linux_kernel"],"type":"null_dereference","year":"2025"},"n_packages":0,"n_references":7,"next":{"headline":"LoongArch: KVM: Fix stack protector issue in send_ipi_data()","id":"CVE-2025-39704"},"packages":[],"prev":{"headline":"ipv6: sr: Fix MAC comparison to be constant-time","id":"CVE-2025-39702"},"products":["Linux"],"published":"2025-09-05","related":[{"cvss_score":10,"headline":"ProFTPD Improper Access Control","id":"CVE-2015-3306","kev_date_added":"2026-10-08","published":"2015-05-18"},{"cvss_score":9.9,"headline":"RoundCube Webmail Deserialization of Untrusted Data","id":"CVE-2025-49113","kev_date_added":"2026-02-20","published":"2025-06-02"},{"cvss_score":9.8,"headline":"GNU InetUtils Argument Injection","id":"CVE-2026-24061","kev_date_added":"2026-01-26","published":"2026-01-21"},{"cvss_score":9.8,"headline":"Linux Kernel Improper Check for Unusual or Exceptional Conditions","id":"CVE-2025-39682","kev_date_added":"2026-09-18","published":"2025-09-05"},{"cvss_score":9.8,"headline":"Mozilla Firefox Use-After-Free","id":"CVE-2024-9680","kev_date_added":"2024-10-15","published":"2024-10-09"},{"cvss_score":9.8,"headline":"RARLAB UnRAR Directory Traversal","id":"CVE-2022-30333","kev_date_added":"2022-08-09","published":"2022-05-09"},{"cvss_score":9.8,"headline":"Roundcube Webmail SQL Injection","id":"CVE-2021-44026","kev_date_added":"2023-06-22","published":"2021-11-19"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-15","vendors":["Linux"]},"summary":"A remote attacker can cause a kernel crash and denial of service by sending malformed HSR frames that trigger a null dereference in the network stack.","url":"https://insights.sbomify.com/CVE-2025-39703/"}